That looked exactly like how a spec of dust moves and how a spec of dust appears in that kind of lighting. :) Dust tends to move around erratically as it drifts in the air. Most of what people call orbs are just specs of dust (or sometimes small flying insects) drifting in front of the camera. Light reflects off the dust and it looks like an orb. I have however seen one video where someone caught something like a big bright glowing moving light, and in that particular case it looked quite different than the usual dust or rain drops. It was much bigger and brighter.